Rotor starting mechanism



March 28, 1950 s. KAHN 2,502,048

, ROTOR STARTING MECHANISM Filed Dec. 22, 1948 Patented Mar. 28, 1950 ROTOR STARTING'MECHANISM Samuel Kahn, Bridgeport, Conn., assignor. to

Schick Incorporated, Stamford, Conn a corporation of. Delaware ApplicationzDecember 22, 1948,- Serial No. 56,751'

7' Claims. 1

Various types of "rotary machines are required tobe given an initial-spinainorder to: start or to facilitate or= ensure :theirrstarting; an example being the familiar electric;shaverv equipped with an impulse type-1: motor.. Unless their contact mechanism is;manuallypreepositioned or happens to bepositioneditooprovide the; necessary favorable conditions, .such motors are not selfstarting when current is r supplied to them, and the common practieeihas. been to provide a starter wheel, secured .to the- -.armature=shaf-t and having apcrtion-exposed fOr'turnin-g bythefmger or thumb to supply the-initialspin.

The presentiinvention, which is particularly useful for the starting of such'motors, provides a push button:type of-starting device which is of simple, trouble-freev construction, and which lends itself to combinationzwith aiswitch, when desired, for closing and opening-thecircuit coincidentally with themanipulation of the button to start and stop' the motor.

The invention will be readily .=understood.from the iollowingdescription ofi the accompanying drawings in which it is shown ,in-preferred form applied to a well-known make of electric shaver.

In the drawings,

Fig. 1 is an elevation of-theustartersequipped shaver, one half of the casev-being-removed to show the interior construction;

Fig. 2 is a broken out viewof-theopposite-side of the shaver. showingthe: starter mechanism itself;

Fig. 3 is another view otthestarter-mechanism indicating other positions of the parts; and

Fig. 4 is a detail of-=,the-push button. and associated lever viewed, as; on the, line IV--IV. of Fig; 2.

The motor I of the illustrated. shaver includes an armature shaft'2 andn-cam-cperated contact mechanism 3 by which the circuit of the field coil 4 is made and broken; all ,arrangedgand op;- erating in the usual manner. In this preferred form the field circuit 'is'arranged to .b'econtrolled by aswitch consisting of afixed contact .5 and .a springblade 6 which is biased/to open-circuit position. As sh'owh',' the-switch. blade is located by a boss l upstanding fromithegcustomary,insulating bridge piece 3 in which the armature shaft is journaled and on which the contact mechanism is mounted.

The motor is controlled by a thumb-operated button 9 pivotally connected by a stud ID with the bridge piece 8, the button moving between the stop and start positions illustrated in Figs. 2 and 3, respectively.

From one face. of the starter button there projects alug or armr H (Figs. 1 and a) which serves to flex the switch blade into engagement with contact 5 when the starter buttonismoved from; stop to start position and to permit the blade to'disengfiage. itself from the contact and break the motor. circuit when. thevstarter button is moved-in the opposite direction,

The starting movement of the button-is also adapted to impart a spin to the armature shaft coincidentally with the closure of the switch. It will presently be apparentthat, lay-appropriate adjustment of .the parts, the actual engagement of the switch blade firwith contaoti canbe made to occur at such time; relatively'to the spinning of the armature; as may be most appropriate for the particular motor design.

The armature shaft is rotated byaipinion 12 secured to one-end of the shaft and a buttonoperated, gear quadrant IS, the partsbeing so organized that, when .the' push button is moved.

to start the motor; the quadrant movesinto mesh with the gear and sweeps through a sufiicient arc to pass clear of the gear. on the far side; but, when the push button is moved to stop the motor, the quadrant moves back to its initial position along. a differentpath .to. avoid clashing with the teeth of the still-rotating gear, the motor actually being stopped asthe resultof the breaking of the circuit by switch:-5--6.-

Mounted to pivot about the axis of studio is afirst lever hi, of cranked. formand having a laterally bent ear l5 which is engaged ina slot l6 formed intone .sideof the starter button, so that. movementof thebutton'frcm stop to start position swingslever l4 counter-clockwise about stud i0.

To'the outer 'endxoi lever l4 isattached an extension; in the form of a-isecond lever H, which has a" yieldable, friction pivot connectionwith the .firstleven The-connection includes a stud 18; located ill'a. hole inilever Hand in a slot. IS in lever M, and a friction or springgwasher of any suitable formAnot-showniso. that the two levers are movable as a..unitxor-relatively to each other, depending: upon the-freedom of movement of leveri'l. It willbe noted that leverll is. a two-armed, crankclever, the loweruarm carrying the gear quadrant mentioned above; and more or less at the junction of the two arms of lever ll is an internal cam or triangular slot 28 which encircles a stud 2| upstanding from the insulating bridge piece 8. Slot 2i! constitutes a track which, by engagement with stud 2i, limits the bodily movement of lever I1 and, at appropriate times, causes it to pivot about stud 2i, as follows.

The initial movement of the starter button swings lever M from the full to the dotted line position shown in Fig. 2 and, throughout this movement, lever i1 moves bodily (as an extension of lever l4) from its full to dotted line position as shown in Fig. 2. At this juncture, the gear quad rant will have engaged pinion l2 and the upper corner of the cam slot will have engaged stud 2 l. Thus, bodily movement of lever i1 is arrested; and, as the movement of the starter button is continued, the friction-pivot connection between the two levers yields (stud l8 sliding in slot [9) and lever ii is rotated about stud 2| and the gear quadrant swept through the pinion teeth to spin the armature shaft. The limit position of the parts at the end of this movement of the starter button is shown in full lines in Fig. 3. The armature having been spun and the switch coincidentally closed. the motor is thus set in operation.

When the starter button is moved in the oppo site direction to stop the motor, the initial move ment, as before, is of levers M and ll as a unit (swinging clockwise about pivot stud ID). This bodily movement of the two levers results in the gear quadrant being lifted clear of the teeth of pin on l2 and continues until stud 2| is engaged by the lower corner of cam slot 20. At such time the parts are in the dotted line position shown in Fig. 3.

As the starter button movement continues, the friction pivot connection yields and lever 11 ro tates about stud 2|, returning finally to the position shown in full lines in Fg. 2. Coincidentally with the foregoing, arm I! will have been withdrawn, permitting the switch blade 6 to move to open-circuit position (Fig. 1) and the motor thereby stopped.

While onl a preferred embodiment of the invent on has been described, it will be understood that the principles of the invention are susceptihle of application in various form and to modification as the requirements of any particular installation may render desirable.

In the light of the foregoing, the following is cla med:

1. A starting device comprising the combination of a manually operable first lever, an extension of such lever in the form of a second lever having a yielding, friction-pivot connection with the first lever, whereby said levers are movable as a unit in response to initial movement of the first lever, means for limiting such unit movement and inducing movement of the second lever relatively to the first in response to continued movement of the first lever, said means comprising a fixed pivot encircled by a slot in the second lever on the side of said connecton remote from the first lever, a starter extension associated with said second lever, and a shaft to be rotated positioned for engagement by said starter extension when the said fixed stud is in one of its limit positions in the track slot.

2. A starting device comprising the combination with a shaft to be rotated, of a pivoted starter button movable back and forth between stop and start positions, a first lever associated with said button for movement thereby, a second lever having a friction-pivot connection with the first lever and having a track slot, a fixed stud projecting into the track slot, and a shaft actuating arm projecting laterally from the second lever into proximity with, but spaced from, the shaft when the button is in its said stop position, a wall of the track slot being located to engage the said stud when the said button is Positioned between its said stop and start positions.

3. A starting device comprising the combination with a shaft to be rotated and a pinion secured thereto, of a two-armed crank lever having a gear quadrant on one arm thereof and a track slot formed at the junction of the crank lever 1. arms, a stationary pivot stud in said track slot,

a manually operable starting lever, and a frictionpivot connection between the starting lever and the other arm. of the said crank lever.

4. In a starter mechanism, a composite, bodilymovable lever unit comprising a manually operable first leverand an extension connected thereto by a friction-pivot joint, said extension having a laterally projecting starter arm and a track slot at the junction of the extension and the starter arm, and means for breaking said joint and rotating said starter arm comprising a stationary stud located in said track slot.

5. In a starter for a motor having a circuit and a switch in such circuit: a composite, bodilymovable lever unit comprising a manually 0perable first lever and an extension connected thereto by a friction-pivot joint, said extension having a laterally projecting starter arm, means for breaking said joint and rotating said starter arm, and a push button operatively associated both with said switch and with said first lever.

6. In a starter for a motor having a circuit and a switch in such circuit: a composite, bodilymovable lever unit comprising a manually operable first lever and an extension connected thereto by a friction-pivot joint, said extension having a laterally projecting starter arm and a track slot at the junction of the extension and the starter arm, means for breaking said joint and rotating said starter arm comprising a stationary stud located in said track slot, and a push button operatively associated both with said switch and with. said first lever.

7. In a starter of the kind described, a composite, bodily-movable lever unit comprising a manually operable first lever and an extension connected thereto by a friction-pivot joint, said extension having a laterally projecting starter arm, means for breaking said joint and rotating said starter arm, and'a push button operatively associated with said first lever.

SAMUEL KAI-IN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,828,895 Hanley I Oct. 2'7, 1931 2,229,939 Service et al Jan. 23, 1941 2,286,629 Kobler et al. June 16. 1942 

